<template>
    <div class="login_container">
        <div class="login_box">
            <div class="avator_box">
                <!-- 头像区域 -->
                <img src="../assets/logo.png" alt="">
            </div>
            <!-- 表单区域 -->
                <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
                    <!-- 用户名 -->
                    <el-form-item prop="username">
                        <el-input v-model="loginForm.username"
                            placeholder="请输入用户名"
                            prefix-icon="el-icon-user"
                        ></el-input>
                    </el-form-item>
                    <!-- 密码 -->
                    <el-form-item prop="password">
                        <el-input v-model="loginForm.password"
                            placeholder="请输入密码"
                            prefix-icon="el-icon-lock"
                            show-password
                        ></el-input>
                    </el-form-item>
                    <!-- 按钮区域 -->
                    <el-form-item class="btns">
                        <el-button type="primary" @click="login">登 录</el-button>
                        <el-button type="info" @click="resetloginForm">重 置</el-button>
                    </el-form-item>
                </el-form>
        </div>
    </div>
</template>

<script>
export default {
  data () {
    return {
      loginForm: {
        // 这是登录表单的数据绑定对象
        username: 'admin',
        password: '123456'
      },
      loginFormRules: {
        username: [
          { required: true, message: '请输入登录名称', trigger: 'blur' },
          { min: 4, max: 12, message: '长度在 4 到 12 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入登录密码', trigger: 'blur' },
          { min: 6, max: 16, message: '长度在 6 到 16 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 重置表单
    resetloginForm () {
      // console.log(this)
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        // console.log(valid)
        if (!valid) {
          return false
        } else {
          const { data: res } = await this.$http.post('login', this.loginForm)
          // console.log(res)
          if (res.meta.status !== 200) {
            // console.log('登录失败')
            this.$message.error('登录失败')
          } else {
            // console.log('登录成功')
            this.$message.success('登录成功')
            // 1.将登录成功后的token保存到客户端的sessionStorage中
            //  1.1项目中除了登录之外的其它API接口，必须在登录之后才能访问
            //  1.2token只应在当前网站打开期间生效，所以将token保存在seesionStorage中
            console.log(res)
            window.sessionStorage.setItem('token', res.data.token)
            // 2.通过编程是导航跳转到后台主页，路由地址是 /home
            this.$router.push('/home')
          }
        }
      })
    }
  }
}
</script>

<style lang="less" scoped >
    .login_container {
        background-color: #2b4b6b;
        height: 100%;
    }
    .login_box {
        width: 450px;
        height: 300px;
        background-color: #fff;
        border-radius: 3px;
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%,-50%);

        .avator_box {
            height: 130px;
            width: 130px;
            border: 1px solid #eee;
            border-radius: 50%;
            padding: 10px;
            box-shadow: 0 0 10px #ddd;
            position:absolute;
            left:50%;
            transform: translate(-50%,-50%);
            background-color: #fff;
            img {
                width: 100%;
                height: 100%;
                border-radius: 50%;
                background-color: #eee;
            }
        }

        .login_form {
            position: absolute;
            bottom: 0;
            width: 100%;
            padding: 0 20px;
            box-sizing: border-box;
        }

        .btns {
            display: flex;
            justify-content: flex-end;
        }
    }
</style>
